Only the answers that assign the array in ONE statement are going to work in your context (defining a class property) unless you put them all in the constructor. By the same token, I don't think that print_r is going to work without being in a method...

The syntax to define an array is array(key0 => value0, key1 => value1, key2 => value2, ...). Since a two-dimensional array in PHP is just multiple arrays as values in an array, it would look like this: